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The CoGeNT experiment has searched for dark matter. It uses a single germanium crystal (~100 grams[1]) as a cryogenic detector for WIMP particles. CoGeNT has operated in the Soudan Underground Laboratory since 2009.
Results

Their first announcement was an excess of events recorded after 56 days.[2] Juan Collar, who presented the results to a conference at the University of California, was quoted: "If it's real, we're looking at a very beautiful dark-matter signal".[2][3]

This signal conflicts with other searches that have failed to find any evidence, such as XENON and LUX but appears to confirm results from DAMA.

They observed an annual modulation in the event rate that could indicate light dark matter.[4]

The annual modulation has continued to be seen in 3 years of data.[1]

However more recent work has shown that the excess of events attributed to a tentative dark matter signal was in fact due to an underestimated background from surface events.[5] After accounting for this background there is no evidence for a signal in data from the CoGeNT experiment and no tension with null results from other experiments.[6][7]
References

Edwin Cartlidge (Jan 20, 2014). "CoGeNT gives further backing to annual dark-matter variation".
Eric Hand (2010-02-26). "A CoGeNT result in the hunt for dark matter". Nature. Nature News. doi:10.1038/news.2010.97.
C. E. Aalseth; CoGeNT collaboration (2011). "Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector". Physical Review Letters. 106 (13): 131301.arXiv:1002.4703. Bibcode:2011PhRvL.106m1301A. doi:10.1103/PhysRevLett.106.131301. PMID 21517370.
James Dacey (June 2011). "CoGeNT findings support dark-matter halo theory". physicsworld. Retrieved 5 May 2015.
Davis, Jonathan; McCabe, Christopher; Boehm, Celine (August 2014). "Quantifying the evidence for Dark Matter in CoGeNT data". Journal of Cosmology and Astroparticle Physics. 1408 (8): 014. arXiv:1405.0495. Bibcode:2014JCAP...08..014D. doi:10.1088/1475-7516/2014/08/014.
Aalseth, C.E. (5 Feb 2015). "Maximum Likelihood Signal Extraction Method Applied to 3.4 years of CoGeNT Data".arXiv:1401.6234 [astro-ph.CO].

Davis, Jonathan (June 12, 2015). "The Past and Future of Light Dark Matter Direct Detection". Int. J. Mod. Phys. A. 30 (15): 1530038.arXiv:1506.03924. Bibcode:2015IJMPA..3030038D. doi:10.1142/S0217751X15300380.

External links

CoGeNT Dark Matter Experiment website

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Dark matter
Forms of
dark matter

Baryonic dark matter Cold dark matter Hot dark matter Light dark matter Mixed dark matter Warm dark matter Self-interacting dark matter Scalar field dark matter Primordial black holes


Hypothetical particles

Axino Axion Dark photon Holeum LSP Minicharged particle Neutralino Sterile neutrino SIMP WIMP

Theories
and objects

Cuspy halo problem Dark fluid Dark galaxy Dark globular cluster Dark matter halo Dark radiation Dark star Dwarf galaxy problem Halo mass function Mass dimension one fermions Massive compact halo object Mirror matter Navarro–Frenk–White profile Scalar field dark matter

Search
experiments
Direct
detection

ADMX ANAIS ArDM CDEX CDMS CLEAN CoGeNT COSINE COUPP CRESST CUORE D3 DAMA/LIBRA DAMA/NaI DAMIC DarkSide DARWIN DEAP DM-Ice DMTPC DRIFT EDELWEISS EURECA KIMS LUX LZ MACRO MIMAC NAIAD NEWAGE NEWS-G PandaX PICASSO PICO ROSEBUD SABRE SIMPLE TREX-DM UKDMC WARP XENON XMASS ZEPLIN

Indirect
detection

AMS-02 ANTARES ATIC CALET CAST DAMPE Fermi HAWC HESS IceCube MAGIC MOA OGLE PAMELA VERITAS

Other projects

MultiDark PVLAS

Potential dark galaxies

HE0450-2958 HVC 127-41-330 Smith's Cloud VIRGOHI21

Related

Antimatter Dark energy Exotic matter Galaxy formation and evolution Illustris project Imaginary mass Negative mass UniverseMachine

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